Alloy containing iron, nickel, chromium



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0F PARIS, FRANCE, ASSIGNOR 1'0 SOCIETE ANONYME DE COMMENTBY,EOURGHAMBAULT, & DEGAZEVILLE, OF PARIS, FRASCE. A

Y oonramm'o men, meant, cnnomrmn.

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T 0 all wiwm it may concern:

Be it known that I, Pmnnn GIRIN, a citizen of the Republic of France,residing in Paris, France, have invented certain new and usefulImprovements in a new Alloy Contalning Iron, Nickel, Chromium, of whichthe following is a specification.

Up to the present I am not acquainted,

from the point of view of their application to chemical industries, withcommon alloys and metals which unite high mechanical qualities with ahigh resistance to the action of acids.

The present invention relates to alloys of iron, nickel, chromium, andmanganese, to which may be added other metals, such alloy beingsusceptible of being cast, forged, rolled, drawn out, and otherwiseworked and treated in the most complex manner, having a high mechanicalresistance and a complete absence of fragility at all temperatures andpractically unattacked by strong acids, especially organic acids, andequally by alkalis in solution or in fusion. Such an alloy may comprisebesides iron Nickel 20 to 25 per cent. Chromium" 10. -170 15- Manganese1 ,to 2 Carbon 0.2 to 0.5 p

The compositions given above may undergo relatively important variationswithout the essential properties being sensibly modified; in particularthe content in nickel may be cairied even up to 40 per cent if we wishto best fulfil the conditions relating either to the elasticity or thecoeflicient of expansion of the alloy.

The manganese in the alloy insures satisfactory malleability.

The combined action of the nickel and of the chromium is to bring theiron into the condition 7. The alloy has then the mechanical advantagesof. ferro-nickels of 25 per cent nickel, withor without 'a smallquantity of chromium, notably the property of being considerablydeformed without rendering any irreversible transformation Specificationof Letters Patent.

prolonged exposure to hot and moist gasesz' it suppresses, for example,the pittings and local changes which are an essential obstacle to theuse in these conditions of ferronickel, with or without small additionsof chromium.

The addition of chromium in' considerable quantities, such as 10 to 15per cent, to a ferro-nickel reduces the corrosion of the metal by strongacidseither hot or coldto an insignificant amount.

By way of example. I may note that an alloy of the group defined abovepossesses at ordinary temperature a mechanical resistance of to 80 kgs.per sq. mm., with a coeiiicient of elongation of 30 per cent and a'resilience which never falls below 25 kgms, as measured by the Guilleryapparatus on a sample of a 10 mm. ube having a rounded groove of a depthof',2 mm In .cold concentrated nitric acid the loss of in chemicalindustry for all the apparatus .of complicated form or which is requiredto resist shocks whether due to high pressure (such as the worms,norias. centrifugal pumps etc) which are required to be in contact withacid materials. It would replace gold in' the manufacture ofinoxidizable pens. p

Having thus described the nature of the said invention and the bestmeans'I know of carrying the same into practical effect, I declare thatwhat I claim is:- V

An alloy of iron, nickel, chromiiun and manganese, containing nickel, 20to 25 per cent, chromium, 10 to 15 per cent, manganese', 1 to 2 percent, carbon, 0.2 to 0.5 per Patented July Ill, 1922.

Application filed. December 9, 1918. Serial No. 265,984.

cent, such alloy having, together with the 'mechanical qualities of thebest steels. a

high' resistance to attack by strong acids, organic acids and alkalis,in solution or in fusion.

'In witness whereof, I have hereunto signed my name. 7 r

PEERRE GKREEI.

